Antenna



FIG. 1 is a front and top perspective view of an antenna showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view, the left being a mirror image thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a front and top perspective view of a modified form of an antenna showing our new design;

FIG. 7 is a front elevational view thereof;

FIG. 8 is a right side elevational view, the left being a mirror image thereof;

FIG. 9 is a top plan view thereof; and

FIG. 10 is a bottom plan view thereof. 

The ornamental design for an antenna, substantially as shown and described. 